Java VM monitoring and the Health Center API. William Smith

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1 Java VM monitoring and the Health Center API William Smith

2 Health Center overview What problem am I solving? What is my JVM doing? Is everything OK? Why is my application running slowly? Why is it not scaling? Am I using the right options? Live monitoring tool with very low overhead ( < 1% ) Understand how your application is behaving Monitor Class loading, File I/O, Environment settings, Garbage Collection, Method Profiling, Locking, Native memory use, Threads Diagnose potential problems, with recommendations Works at the JVM level Suitable for all Java applications Powerful API allowing embedding of Health Center into other applications

3 Health Center overview continued Class loading visualisation Shows all loaded classes Shows load time Identifies shared classes Live class histogram information Garbage Collection visualisation Visualises heap usage and gc pause times over time Identifies memory leaks Suggests command-line and tuning parameters Same recommendation logic as GCMV Environment reporting Detects invalid Java options Detects options which may hurt performance or serviceability Useful for remote diagnosis of configuration-related problems

4 Health Center overview continued I/O Monitor application file open/close events as they occur Lists currently open files Native Memory Detect native memory leaks in application Determine if external forces are using more memory Memory counters showing which parts of the JVM are using the most native memory

5 Health Center overview continued Method Profiling Always-on profiling offers insight into application activity Identifies the hottest methods in an application Full call stacks to identify where methods are being called from and what methods they call No byte code instrumentation, no recompiling Java Lock analysis Always-on lock monitoring Quickly allows the usage of all locks to be profiled Helps to identify points of contention in the application that are preventing scaling

6 Health Center overview continued Threads view List of current threads and states Deadlock detection and analysis Number of threads over time See contended monitors Live control of application Trigger dumps Enable verbosegc collection

7 Health Center installation The tool is provided in two parts: An agent that collects data from a running application. An Eclipse-based client that connects to the agent. The Agent ships with the following Java SDK versions: Java 5sr9 and upwards Java 6sr3 and upwards The latest version of the agent is always available from within the Health Center Client Recommended to always update to the latest version of the agent Agent package unzips over the JRE directory of the Java installation you are using to run the application

8 How to enable an application for monitoring Full instructions are provided within the help shipped with the Health Center Client but in most cases as simple as : For Java 5 SR10 and later, or Java 6 SR5 and later (including Java 7) java Xhealthcenter HelloWorld (can be used in production) For 5 SR9 and earlier, or Java 6 SR4 and earlier java agentlib:healthcenter Xtrace:output=healthcenter.out HelloWorld (not recommended for use in a production environment)

9 How to install the client Download and install IBM Support Assistant Workbench 4.1 An Eclipse based tool You select the IBM support plugins you want In the workbench, select Update > Find New... > Tools Add-ons Expand JVM-based Tools Select IBM Monitoring and Diagnostics Tools for Java Health Center Click Next, accept the license Click Next, confirm the tool selected, Click Install The Eclipse update mechanism will install the Health Center plug in into IBM Support Assistant

10 How to launch the client In IBM Support Assistant go to the Home tab Click Analyze Problem Select Health Center in the Tools Catalog, click Launch

11 IBM Health Center Demonstration

12 Access Health Center data with the API The 2.1 release of Health Center contains a powerful API. The API allows Java developers to embed Health Center in their applications With a few lines of code, you can embed the monitoring power of Health Center in your own Eclipse based application and harness its monitoring power to troubleshoot problems // Create the connection object: ConnectionProperties conn1 = new ConnectionProperties("localhost", 1973); // Connect to the Health Center agent, using the previous connection // settings: HealthCenter hcobject = HealthCenterFactory.connect(conn1, true); // Get garbage collection data and print: GCData gcdata = hcobject.getgcdata(); System.out.println("GC Mode is " + gcdata.getgcmode().tostring());

13 Getting started with the Health Center API Detailed steps with screen shots in online articles (see final slide) Online articles have code samples to get started with Download and install Eclipse 3.4 or above from eclipse.org Use the Health Center update site to install the API into Eclipse Create a new Rich Client Platform (RCP) project Add the Health Center API plugin to the build path of the project Start coding to the API

14 Coding Example: Deadlock Detection Set up connection properties Create a Health Centre connection

15 Coding Example continued: Deadlock Detection Request Threads data Check for a thread deadlock Access the threads recommendations Display the deadlock detected message

16 Advanced options for using Health Center Headless mode for data collection without connecting the GUI Useful for scenarios where firewall blocks connection Configurable to limit disk space used Timed collections Interval based collections Started with -Xhealthcenter:level=headless Output:.hcd data files. Open in GUI client or with API. Late Attach enabled Automated javacore creation

17 Quick contacts YouTube videos for a quick introduction to the Twitter feed for tools support

18 Where to find more information IBM Monitoring and Diagnostic Tools for Java on developerworks Health Center API documentation online (it's also in the client help menu) Health Center API articles Monitor a Java application with the Health Center API parts 1 and 2 IBM Support Assistant (ISA) Workbench

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